package com.yupi.yupicturebackend.service.impl;

import cn.hutool.core.bean.BeanUtil;
import cn.hutool.core.util.ObjUtil;
import cn.hutool.core.util.StrUtil;
import com.baomidou.mybatisplus.core.conditions.query.LambdaQueryWrapper;
import com.baomidou.mybatisplus.core.conditions.query.QueryWrapper;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.yupi.yupicturebackend.manager.auth.StpKit;
import com.yupi.yupicturebackend.model.entity.User;
import com.yupi.yupicturebackend.exception.BusinessException;
import com.yupi.yupicturebackend.exception.ErrorCode;
import com.yupi.yupicturebackend.mapper.UserMapper;
import com.yupi.yupicturebackend.model.dto.user.UserQueryRequest;
import com.yupi.yupicturebackend.model.enums.UserRoleEnum;
import com.yupi.yupicturebackend.model.vo.LoginUserVO;
import com.yupi.yupicturebackend.model.vo.UserVO;
import com.yupi.yupicturebackend.service.UserService;
import lombok.extern.slf4j.Slf4j;
import org.springframework.stereotype.Service;
import org.springframework.util.CollectionUtils;
import org.springframework.util.DigestUtils;

import javax.servlet.http.HttpServletRequest;

import java.util.ArrayList;
import java.util.List;
import java.util.stream.Collectors;

import static com.yupi.yupicturebackend.constant.UserConstant.USER_LOGIN_STATE;

/**
* @author MJB_Computer
* @description 针对表【user(用户)】的数据库操作Service实现
* @createDate 2025-06-05 11:57:45
*/
@Service
@Slf4j
public class UserServiceImpl extends ServiceImpl<UserMapper, User>
    implements UserService {

    @Override
    public long userRegister(String userAccount, String userPassword, String checkPassword) {
        //1.校验
        if(StrUtil.hasBlank(userAccount,userPassword,checkPassword)){
            throw new BusinessException(ErrorCode.PARAMS_ERROR,"参数为空");
        }
        if(userAccount.length()<4){
            throw new BusinessException(ErrorCode.PARAMS_ERROR,"用户账号过短");
        }
        if(userPassword.length()<8 || checkPassword.length()<8){
            throw new BusinessException(ErrorCode.PARAMS_ERROR,"用户密码过短");
        }
        if(!userPassword.equals(checkPassword)){
            throw new BusinessException(ErrorCode.PARAMS_ERROR,"两次输入的密码不一致");
        }
        //2.检查是否重复
       LambdaQueryWrapper<User> queryWrapper = new LambdaQueryWrapper<>();
        queryWrapper.eq(User::getUserAccount,userAccount);
        long count = this.baseMapper.selectCount(queryWrapper);
        if(count>0){
            throw new BusinessException(ErrorCode.PARAMS_ERROR,"账号重复");
        }
        //3.加密
        String encryptPassword=  getEncryptPassword(userPassword);
        //4.插入数据
        User user = User.builder()
                .userAccount(userAccount)
                .userPassword(encryptPassword)
                .userName("无名")
                .userRole(UserRoleEnum.USER.getValue())
                .build();
        int insert = baseMapper.insert(user);
        if(insert<=0){
            throw new BusinessException(ErrorCode.SYSTEM_ERROR,"注册失败");
        }
        return user.getId();
    }

    @Override
    public String getEncryptPassword(String userPassword){
        /*加盐*/
        final String SALT = "yupi";
        return DigestUtils.md5DigestAsHex((userPassword+SALT).getBytes());
    }

    @Override
    public LoginUserVO userLogin(String userAccount, String userPassword, HttpServletRequest request) {
        //1.校验
        if (StrUtil.hasBlank(userAccount, userPassword)) {
            throw new BusinessException(ErrorCode.PARAMS_ERROR, "参数为空");
        }
        if (userAccount.length() < 4) {
            throw new BusinessException(ErrorCode.PARAMS_ERROR, "账号错误");
        }
        if (userPassword.length() < 8) {
            throw new BusinessException(ErrorCode.PARAMS_ERROR, "密码错误");
        }
        //2.加密
        String encryptPassword = getEncryptPassword(userPassword);
        //查询用户是否存在
        LambdaQueryWrapper<User> queryWrapper = new LambdaQueryWrapper<>();
        queryWrapper.eq(User::getUserAccount, userAccount)
                .eq(User::getUserPassword, encryptPassword);
        User user = this.baseMapper.selectOne(queryWrapper);
        //用户不存在
        if(user==null){
            log.error("user login failed, userAccount cannot match userPassword");
            throw  new BusinessException(ErrorCode.PARAMS_ERROR,"用户不存在或密码错误");
        }
        //3.记录用户登录状态
        request.getSession().setAttribute(USER_LOGIN_STATE,user);
        StpKit.SPACE.login(user.getId());
        StpKit.SPACE.getSession().set(USER_LOGIN_STATE,user);
        return this.getLoginUserVO(user);
    }
    @Override
    public User getLoginUser(HttpServletRequest request){
        Object attribute = request.getSession().getAttribute(USER_LOGIN_STATE);
        User currentUser = (User) attribute;
        if(currentUser==null||currentUser.getId()==null){
            throw new BusinessException(ErrorCode.NOT_LOGIN_ERROR);
        }
        //数据库查询
        currentUser = baseMapper.selectById(currentUser.getId());
        if(currentUser==null){
            throw new BusinessException(ErrorCode.NOT_LOGIN_ERROR);
        }
        return currentUser;
    }
    @Override
    public LoginUserVO getLoginUserVO(User user){
        if(user==null){
            return null;
        }
        LoginUserVO loginUserVO = new LoginUserVO();
        BeanUtil.copyProperties(user,loginUserVO);
        return loginUserVO;
    }

    @Override
    public boolean userLogout(HttpServletRequest request) {
        //先判断是否登录
        Object userObject = request.getSession().getAttribute(USER_LOGIN_STATE);
        if(userObject==null){
            throw new BusinessException(ErrorCode.OPERATION_ERROR,"未登录");
        }
        //移除登录状态
        request.getSession().removeAttribute(USER_LOGIN_STATE);
        return true;
    }
    @Override
    public UserVO getUserVo(User user){
        if(user==null){
            return null;
        }
        UserVO userVO = new UserVO();
        BeanUtil.copyProperties(user,userVO);
        return userVO;
    }
    @Override
    public List<UserVO> getUserVoList(List<User> userList){
        if(CollectionUtils.isEmpty(userList)){
            return new ArrayList<>();
        }
        return userList.stream().map(this::getUserVo).collect(Collectors.toList());
    }

    @Override
    public QueryWrapper<User> getQueryWrapper(UserQueryRequest userQueryRequest){
        if(userQueryRequest==null){
            throw  new BusinessException(ErrorCode.PARAMS_ERROR,"请求参数为空");
        }
        Long id = userQueryRequest.getId();
        String userAccount = userQueryRequest.getUserAccount();
        String userName = userQueryRequest.getUserName();
        String userProfile = userQueryRequest.getUserProfile();
        String userRole = userQueryRequest.getUserRole();
        String sortField = userQueryRequest.getSortField();
        String sortOrder=  userQueryRequest.getSortOrder();

        QueryWrapper<User> queryWrapper = new QueryWrapper<>();
        queryWrapper.eq(ObjUtil.isNotNull(id), "id", id);
        queryWrapper.eq(StrUtil.isNotBlank(userRole), "userRole", userRole);
        queryWrapper.like(StrUtil.isNotBlank(userAccount), "userAccount", userAccount);
        queryWrapper.like(StrUtil.isNotBlank(userName), "userName", userName);
        queryWrapper.like(StrUtil.isNotBlank(userProfile), "userProfile", userProfile);
        queryWrapper.orderBy(StrUtil.isNotEmpty(sortField), sortOrder.equals("ascend"), sortField);
        return queryWrapper;

    }

    @Override
    public boolean isAdmin(User user) {
        return user!=null&&UserRoleEnum.ADMIN.getValue().equals(user.getUserRole());
    }
}




